DTC B1382, B1383, or B1384. GMC Truck Canyon Pickup

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2007 🢒 Canyon Pickup - 2WD 🢒 DTC 🢒 DTC B1382, B1383, or B1384

Table 1:

Circuit Description

The body control module (BCM) monitors the ignition inputs Ignition Off/Run/Crank, Ignition 1 Run/Crank and the Ignition Accessory signals supplied from the ignition switch. The BCM uses the sequence that the signals appear, their voltage levels and the engine run flag (ERF) status to determine the power mode. Battery voltage is supplied to the ignition switch by a fuse in the underhood fuse block. The Ignition Accessory signal also wakes up the powertrain control module (PCM). The following table shows the correct ignition switch signals:

Correct Ignition Switch Inputs

Ignition Switch Position	BCM Input and Scan Tool Display
Ignition Switch Position	Ignition Accessory	Ignition 1 Run/Crank	Ignition Off/Run/Crank
OFF	Inactive	Inactive	Active
ACC	Active	Inactive	Inactive
ON	Active	Active	Active
START	Inactive	Active	Active

DTC Descriptors

This diagnostic procedure supports the following DTCs:

•	DTC B1382 Device Ignition Accessory ON and ACC Circuit Low

•	DTC B1383 Device Ignition Accessory ON and ACC Circuit High

Conditions for Running the DTC

Battery voltage is 9-16 volts.

Conditions for Setting the DTC

DTC B1382

The BCM detects that the accessory voltage circuit is open or short to ground for at least 1 second.

DTC B1383

The BCM detects that the accessory voltage circuit is shorted to voltage for at least 10 seconds.

Action Taken When the DTC Sets

•	The BCM stores DTC B1382 or B1383 in memory.

•	The BCM determines a fail-safe power mode dependent on the last valid power mode detected and the state of the ERF.

Conditions for Clearing the DTC

•	A current DTC clears when the malfunction is no longer present.

•	A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Step	Action	Yes	No
Schematic Reference: Body Control System Schematics and Power Distribution Schematics Connector End View Reference: Data Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Install a scan tool. Observe the Ignition Accessory parameter with the scan tool. Turn the ignition to all positions and compare the parameter to the correct ignition switch inputs table above. Does the Ignition Accessory parameter display correctly?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Place the ignition switch in the OFF position, leaving the key in the ignition. Disconnect the body control module (BCM) harness connector 2. Probe the accessory voltage circuit with a test lamp connected to a good ground. Probe the accessory voltage circuit with a test lamp connected to B+. Does the test lamp illuminate for either test?	Go to Step 7	Go to Step 4
4	Turn the ignition switch to the RUN position. Probe the accessory voltage circuit at the BCM connector 2 with a test lamp connected to a good ground. Turn the ignition switch to ACC. Does the test lamp illuminate in both RUN and ACC?	Go to Step 5	Go to Step 8
5	Turn the ignition OFF. Disconnect the BCM harness connector 1. Probe the accessory voltage circuit in the connector with a test lamp connected to a good ground. Probe the accessory voltage circuit with a test lamp connected to B+. Does the test lamp illuminate for either test?	Go to Step 6	Go to Step 10
6	Disconnect the powertrain control module (PCM). Test the accessory voltage circuit between the BCM and the PCM for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 15	Go to Step 12
7	Disconnect the ignition switch harness connector. Test the accessory voltage circuit for a short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 15	Go to Step 9
8	Disconnect the ignition switch harness connector. Test the accessory voltage circuit for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs . Test the battery positive voltage circuit of the ignition switch for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 15	Go to Step 9
9	Inspect for poor connections at the harness connector of the ignition switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 15	Go to Step 13
10	Inspect for poor connections at the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 15	Go to Step 14
11	Inspect for poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 15	Go to Step 12
12	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 15	--
13	Replace the ignition switch. Refer to Ignition and Start Switch Replacement . Did you complete the replacement?	Go to Step 15	--
14	Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 15	--
15	Reconnect all disconnected connectors. Turn the ignition ON, with the engine OFF. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTCs as specified in the supporting text. Does DTC B1382 or B1383 reset?	Go to Step 1	System OK